Build Failed: use of unstable library feature '_memoffset__offset_of_impl'

[yjhmelody]

# Run anchor build

use of unstable library feature 'offset_of'
   --> /Users/yjhmelody/.cargo/registry/src/index.crates.io-6f17d22bba15001f/solana-program-1.18.22/src/program.rs:441:20
    |
441 |         assert_eq!(offset_of!(StableInstruction, program_id), 48);
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #106655 <https://github.com/rust-lang/rust/issues/106655> for more information
    = help: add `#![feature(offset_of)]` to the crate attributes to enable
    = note: this compiler was built on 2024-01-15; consider upgrading it if it is out of date
    = note: this error originates in the macro `_memoffset__offset_of_impl` which comes from the expansion of the macro `offset_of` (in Nightly builds, run with -Z macro-backtrace for more info)

anchor --version
anchor-cli 0.30.1
solana --version
solana-cli 1.18.17 (src:b685182a; feat:4215500110, client:SolanaLabs)
cargo --version
cargo 1.82.0-nightly (ba8b39413 2024-08-16)
rustc --version
rustc 1.82.0-nightly (5aea14073 2024-08-20)

It could not generate idl but works for anchor build --no-idl.

[acheroncrypto]

It looks like offset_of was stabilized in rustc 1.77 (rust-lang/rust#106655 (comment)).

The error logs mention:

this compiler was built on 2024-01-15; consider upgrading it if it is out of date

which could be the root of the problem. I'd try overriding the nightly version with the RUSTUP_TOOLCHAIN environment variable (release notes).

[yjhmelody]

Ok, it work when override it. But better to always print current version for anchor build, since we really do not know which version it was being used.